Hi, I've recently catch a couple of Nakamichi cm300 JB mod. They are terminated with a 3.5mm mini jack that I plug in a ca9200 or a ca battery box.I usually tape with at853>ca9200/bbox and I use a single (not rechargeable) 9v battery for two shows (about 6 hours).Can I use a 9v battery for two shows also with nak cm-300? Or is it safer using a fresh 9v battery for each show?Thanks for any suggestion (eventually suggestion for excellent 9v rechargeable battery tested on the field with nak cm-300/at853>ca9200/ca-bbox)